The officer asked the security guards to be ____
A. on purpose
B. on the alert
C. on edge
D. off their head
BSMRSTUUnit-Dইংরেজি - গ্রামার ও ভোকাবুলারিCompleting SentenceBSMRSTU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
সঠিক উত্তরঃ
B.
on the alert
Explanation:

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